Single shot riverting device

ABSTRACT

The device is intended for clinching steel and aluminium alloy rivets. The striking means travels inside a cylinder and a rivet set means is arranged at one end face of the cylinder, and a cover having a socket receiving the striking means is at the other cylinder end. The striking means working stroke is effected under the action of a high-pressure compressed gas, and a low-pressure compressed gas is used to return the striking means to its initial position. The device incorporates a control valve opening a through hole made in the cover in the vicinity of the socket during the striking means working stroke.

it tates Ftet 1 Fedosenko et a1.

[ 1 SINGLE SHOT RlVERTlNG DEVICE [76] Inventors: Igor GrigorievichFedosenko, 602

mikroraion, 51, kv. 206; Vadim Grigorievich Kononenko, ulitsa Chkalova15, kv, 12; Vladimir Semenovich Lepetjukha, 607 mikroraion 52, kv. 8;Lev Petrovich Vasilchenko, ulitsa Volodarskogo,

57a, kv. 20, all of Kharkov, U.S.S.R. 22 Filed Apr. 20, 1973 [21] Appl.No.: 353,016

[30] Foreign Application Priority Data Mar. 16, 1972 U.S.S.R 1759257June 20, 1972 U.S.S.R 1795791 [52] US Cl 173/121, 91/4 R, 91/5, 173/134,173/170 [51] int. Cl B2lj 15/22 [58] Field of Searchl73/121,120,119,115; 91/5, 4 R, 4 A

[56] References Cited UNITED STATES PATENTS 5/1967 Arndt 173/1343,601,988 8/1971 Chermensky 60/537 3,625,295 12/1971 Gunning 3,792,7402/1974 Cooley 173/119 Primary Examinerl-lenry C. Sutherland AssistantExaminerWilliam F. Pate, III Attorney, Agent, or Firm-Holman & Stern[57] ABSTRACT The device is intended for clinching steel and aluminiumalloy rivets.

The striking means travels inside a cylinder and a rivet set means isarranged at one end face of the cylinder, and a cover having a socketreceiving the striking means is at the other cylinder end.

made in the cover in the vicinity of the socket during the strikingmeans working stroke.

7 Claims, 6 Drawing Figures PATENTELBEE 31914 I SHEET 10F 4 E h kPATENTE SIB 3l974 SHEET 2 0F 4 K v QRQ Q a PATENTEL 533 31974 SHEET, 3OF 4 PATENTEL 315 31974 SHEET t UP 4 ing the operators health. Inaddition, the quality of single-shot riveted joints is better than thatof multipleshot riveted joints, since the snap heads in single-shotriveted joints are free from cold workhardening.

The prior art single-shot riveting devices comprise a housing having ahollow cylinder wherein a striker is moving and at 'whose one end side arivet set for upsetting rivet heads is arranged. The cylinder cavity,via the openings made therein, is connected with the compressed gassource to provide for the striker return to the initial position.

The striker working stroke is effected due to the compressed gas action,and the operator of such a riveting device has to press a lever ortrigger in an abrupt manner in order to ensure an instantaneous openingof the line supplying the high-pressure compressed gas actuating thestriker. As a result, the operator gets fatigued very rapidly and cannotmaintain the proper shape of rivet snap heads. Besides, these devicesexhibit an insufficient shock energy, since they are generally designedfor operation on kgf/cm of gas mains. Therefore, they do not permit theclinching of aluminium alloy rivets having a diameter over 4 mm whichare particularly difficult to clinch. The pressure variations in thecompressed air main lead to lower shock energy stability, thusdeteriorating the riveting quality.

It is an object of the present invention to provide a single-shotriveting device which will have a sufficient shock energy permitting theclinching of steel and aluminium alloy rivets having a diameter of 5 to6 mm, and which will automatically store the energy, thus substantiallyimproving conditions of work.

This and other objects and purposes of the invention are attained in asingle-shot riveting device comprising a housing having a hollowcylinder in whose cavity a striking means travels and at whose one endface a rivet set means is arranged, said hollow cylinder cavity beingconnected with a compressed gas source via the openings made therein andin the vicinity of said rivet set means for returning said strikingmeans to its intiial position, wherein, according to the invention, saidhousing has a hydropneumatic cylinder arranged therein, saidhydropneumatic cylinder having a floating piston, said floating pistonseparating a high-pressure compressed gas pneumatic portion and ahydraulic portion, which moves into said hydraulic portion when thefluid feed and the compressed gas pressure increases within saidpneumatic portion whereby a working stroke of said striking means iseffected within said hollow cylinder cavity, said last-named cavitycommunicating with said housing hydropneumatic cylinder hydraulicportion and being closed at the other hollow cylinder end face oppositesaid rivet set means by a cover fastened within said housing and havinga clearance-free socket receiving said striking means upon its return tothe initial position and a through hole communicating said socket withsaid housing hydropneumatic cylinder hydraulic portion during thestriking means working stroke and with the fluid feed being shut offfrom this hydropneumatic cylinder hydraulic portion by a control valvemounted in said cover.

in such an embodiment of the invention, higher shock energies areachieved by providing a hydropneumatic cylinder in the devices housing,said housing hydropneumatic cylinder including a high-pressure gaspneumatic portion and a hydraulic portion separated by a floating pistonwhich compresses the gas in the pneumatic portion to a higher degreewhile moving therein.

The increase in the shock energy enables the clinching of steel andaluminum alloy rivets having'a diameter of 5 to 6 mm to be effected withthe use of the devices according to the invention.

The control valve employed in the device according to the inventionpermits the striking means working stroke to be automatically performedafter the energy stroke storage is completed.

The invention is characterized in that the pneumatic portion of saidhydropneumatic cylinder has overrunning stops arranged therein at itsside walls, said stops restricting the floating piston travel, thusproviding for a constant gas compression ratio and energy strokestability.

The invention is further characterized in that the communication of thehollow cylinder cavity with the hydropneumatic cylinder hydraulicportion is effected via the openings closed by the striking means andmade in the hollow cylinder near its cover, the fluid fromhydropneumatic cylinder hydraulic portion flowing into the hollowcylinder during the striking means working stroke through theseopenings, and the hollow cylinder being mounted so that it is capable ofturning around its axis relative to the cover in order to provide forvarying the passage area of the openings for the purpose of controllingthe striking means stroke energy.

Owing to the provision of openings in the hollow cylinder and thepossibility of turning thereof, the striking means stroke energy can becontrolled as it is desired in a particular case, since the fluid flowvelocity through the openings decreases with the opening area reductionresulting in a reduced striking means velocity, and, consequently, areduced stroke energy thereof. The stroke energy may be varied in therange from zero to maximum.

0n the whole, the invention provides a single-shot riveting deviceexhibiting the required shock energy to be effectively controlled in awide range.

In accordance with one embodiment of the invention, the floating pistonmay be made in the form of a washer, said hollow cylinder extendingthrough said washer hole, and the control valve may be made of twoassemblies, one of said assemblies bein a spring-loaded spindle having acone head at its one end for shutting off said cover through hole and aslot at its other end for coupling said spindle with a starting triggeremployed in the device to manually open the valve, said spindle beingarranged in a hydraulic cavity made in said cover and communicating withsaid cover through hole and with said housing hydropneumatic cylinderhydraulic portion, and its other assembly being a hydropneumaticcylinder arranged in said cover and having a piston therein, said coverhydropneumatic cylinder piston being hinge-connected with said triggervia 1 a rod to ensure a small uplift of said trigger after thedisplacement of said cover hydropneumatic cylinder piston prior to themanual opening of said valve but following the gas compression cyclecompletion and separating a pneumatic portion of said coverhydropneumatic cylinder from a hydraulic portion thereof, said coverhydropneumatic cylinder pneumatic portion being connected with saidhousing hydropneumatic cylinder pneumatic portion by means ofpassageways made in said housing and said cover, and said coverhydropneumatic cylinder hydraulic portion being connected with apressure main line via a port made in said cover and with said housinghydropneumatic cylinder hydraulic portion via said cover hydrauliccavity.

When such construction of the control valve is utilized, the partial orsmall ascent of the starting trigger will indicate that the device hasstored the required energy and that the striking means is ready foreffecting a working stroke.

Although the starting trigger of the device should be cocked or pulledup manually by the operator, the operation does not require theapplication of great pulling forces and thus cannot cause weakness orslanting of rivet snap heads. Therefore, the invention provides for theproper clinching of rivets.

' in accordance with another embodiment of the invention, the floatingpiston may be made in the form of a washer, with said cover extendingthrough said washer hole, and the control valve being made in the formof a hydropneumatic cylinder arranged in said cover, said cover for thehydropneumatic cylinder pneumatic portion being connected with saidhousing for the hydropneumatic cylinder pneumatic portion via a portmade in said cover and said cover for the hydropneumatic cylinderhydraulic portion being connected with said housing for thehydropneumatic cylinder hydraulic portion via a passageway made in saidcover, said cover hydropneumatic cylinder having a piston separatingsaid cover for the hydropneumatic cylinder pneumatic and hydraulicportions, said cover of hydropneumatic cylinder piston including ahollow rod arranged in said cover hydropneumatic cylinder hydraulicportion and having ports therein which connect said hollow rod cavitywith said housing of the hydropneumatic cylinder hydraulic portion andwith said cover through said hole, said hollow rod cavity having aspring-loaded check valve arranged therein which opens one of said rodports running into said cover through a hole for draining the fluidtherethrough from said cover socket when said striking means is beingreturned to its initial position, said hollow rod having a free endclearance-free entering said cover through hole and thereby preventingthe fluid from flowing into said cover socket from said housinghydropneumatic cylinder hydraulic portion via said cover through holewhen the fluid is fed into said housing hydropneumatic cylinderhydraulic portion, and leaving this cover through a hole forcommunicating said cover socket with said housing hydropneumaticcylinder hydraulic portion during the said striking means workingstroke.

Thus, in the embodiment of the present invention briefly stated above,the control valve will enable the striking means to effect the workingstroke right after the gas compression process when the housinghydropneumatic cylinder pneumatic portion has been completed.

in accordance with yet another embodiment of the present invention, thecontrol valve may be a movable hollow rod extending through a hole madein the floating piston, one end of said movable hollow rod enteringclearance-free said cover through hole and thereby preventing the fluidfrom flowing into said cover socket via said cover through hole upon thefluid being fed into said housing hydropneumatic cylinder hydraulicportion and leaving said cover through hole for in order to communicatesaid cover socket with said housing hydropneumatic cylinder hydraulicportion during the striking means working stroke, said movable hollowrod having ports connecting its cavity with the housing hydropneumaticcylinder hydraulic portion and with the cover through hole, andshoulders at its outer surface spaced at some distance from each other,one of said shoulders being adapted for restricting the travel of saidmovable hollow rod inside said cover through hole and the other of saidshoulders being adapted for interacting with the floating piston so thatthe latter draws out said, movable hollow rod from said cover throughhole while moving up during said striking means working stroke, saidmovablehollow rod cavity having a spring-loaded check valve arrangedtherein which opens one of said rod ports running into the cover throughhole for draining the fluid therethrough from the cover socket when thestriking means is being returned to its initial position.

In accordance with still another embodiment of the present invention,the control valve may be formed by an extension provided on said cover,the cover through hole passing'through the extension, and by a socketmade in the floating piston, said extension entering clearance-free saidsocket and thereby preventing the fluid from flowing into the coversocket via the through hole when the fluid is fed into the housinghydropneumatic cylinder hydraulic portion and leaving the floatingpiston socket for communicating the cover socket with the housinghydropneumatic cylinder hydraulic portion during the strikingmeansworking stroke and.

the floating piston travel, the cover having a cavity therein which isconnected with the housing hydropneumatic cylinder hydraulic portion andthe cover socket by means of ports made in the cover, said cover cavityhaving a spring-loaded check valve arranged therein which opens one ofthe cover ports running into the cover socket for communicating thecover socket with the housing hydropneumatic cylinder hydraulic portionwhen the striking means is being returned to its initial position.

The single shot riveting devices may be successfully employed for suchproduction operations as metal branding, punching, perforating, caulkingof turbine blade tenons, etc. ln order to meet the standards of thiscase it is only necessary to change the rivet set means for a suitableattachment well known in the art.

Owing to the afore-mentioned features, the singleshot riveting devicehas smaller weight and overall dimensions, exhibits a higher specificshock energy and improved shock stability, thus enabling high-qualityriveted joints to be obtained regardless of the operators skill.

The above-mentioned and other features and objects of the presentinvention and the manner of attaining them will become more apparent andthe invention itself will be best understood by reference to thefollowing detailed description of several embodiments of the inventiontaken in conjunction with the accompanying drawings, wherein:

FIG. .1 shows diagrammatically a longitudinal sectional view of thesingle-shot riveting device according to the invention;

FIG. 2 shows a view'similar to FIG. 1, but illustrating a secondembodiment of the invention;

FIG. 3 shows a view similar to FIG. 1, but illustrating a thirdembodiment of the invention;

FIG. 4 is a view similar to FIG. 1, but illustrating a fourth embodimentof the invention;

FIG. 5 is a sectional view along the line VV of FIG.

FIG. 6 is a view similar to FIG. 5 with the hollow cylinder positionchanged with respect to the cover.

The single-shot riveting device comprises a housing 1 (FIGS. 1, 2, 3, 4)having a hollow cylinder 2 concentrically arranged therein and fixedwith respect to the housing by a retaining ring 3. Cylinder 2 has acavity 4 with a striking means 5 therein which travels reciprocatinglywithin the cavity performing a stroke. A rivet set means 6 for upsettingrivet heads is arranged at one end face of cylinder 2, and a cover 7fixedly jointed with a housing 1 by a nut 3 is arranged at the othercylinder end face (FIG. I). g

In order to ensure the travel of striking means 5, the housing isprovided with a cavity 9 for accomodating the low-pressure gas used toreturn a striking means 5 to its initial position, and a hydropneumaticcylinder having a pneumatic portion 10 used for accomodating thehigh-pressure compressed gas driving a striking means 5 during itsworking stroke and a hydraulic portion I1 separated from the pneumaticcavity 10 by a floating piston 12 compressing the gas in portion It),while moving therein, and thereby increasing the gas pressure therein,i.e., for effecting the compressed gas energy storage for performing aworking stroke by striking means 5 when the fluid is fed into ahydraulic portion 11. The travel of the floating piston 12 is restrictedby overrunning stops I3 mounted in the pneumatic portion 10 at itssidewalls.

A handle 14 having a lever 15 and a flexible shaft or cable 16 isfastened to cover 7.

The cavity 9 is filled with a low-pressure gas from a compressed gassource (not shown in the drawing) via a pipe connection 17, a checkvalve 18, a passageway 19 in cover 7 and a passageway 20 in housing 1;ports 21 made in cylinder 2 in the vicinity of a rivet set means 6 serveto connect housing cavity 9 with cavity 4' of cylinder 2.

Pneumatic portion W is filled with low-pressure compressed gas via apipe connection 22, a check valve 23, a passageway 24 in cover 7 and apassageway 25 in housing 1.

The hydraulic portion ll. of the housing hydropneumatic cylindercommunicates with cavity 4 of cylinder 2 via openings 26 made in thehollow cylinder near cover 7. Openings 26 are shut off by striking means5 on its way back to the initial position and opened during the workingstroke of the striking means 5; openings 26 are adapted for to admit thefluid from the hydraulic portion 11 of the housing hydropneumaticcylinder into cavity 4 of cylinder 2. In order to control the passagesection variation of openings 26 and thus controlling the strikingenergy, hollow cylinder 2 is turnably mounted around its axis A-Arelative to cover 7.

FIG. 5 illustrates the position of hollow cylinder 2, after it has beenturned with respect to cover 7, corresponding to the maximum passagesection of openings 26 when the device operates at a maximum shockenergy.

When a lower striking energy is desired, it will be necessary to turnthe hollow cylinder 2 and set it with respect to cover 7, for example,as shown in FIG. 6. At this cylinder position the passage section ofopenings 26 will be reduced, and, as a result, a smaller amount of thefluid will flow through these openings per unit time.

The cover 7 (FIGS. ll, 2, 3, 4) has a socket 27 made therein which isentered clearance-free by striking means 5 on its way back to theinitial position, whereby the fluid is prevented from flowing into thespace between striking means 5 and the cover 7 from hydraulic portionlll when the fluid is fed into this portion,'and the striking means 5leaves after the required pressure has been built up in portion 11 whenthe gas compression cycle has been completed in the pneumatic POT- tion10.

In the vicinity of a socket 27, cover 7 has a through hole 28 connectingthis socket with hydraulic portion 11 via a control valve 23 mounted incover 7. This control valve shuts off hole 28 during the pressurebuild-up in the housing hydraulic portion 1 1 and opens it during thestriking means working stroke and then returns it to the initialposition.

Control valve 29 may be variously embodied, and the four particularembodiments of the control valve described below do not constitute adeparture from the spirit of the invention but imply variousalternatives or modifications affecting only the cover 7 (as can beclearly seen from FIGS. 1, 2, 3, 4) and the number of passagewaysthrough which the compressed gas is fed into a pneumatic portion 10. Itwill be mentioned that the passageways through which the low-pressurecompressed gas flows into housing cavity 9 are not shown in FIGS. 2, 3,4 in order to make the drawings more easily read.

EMBODIMENT 1 Control valve 29 (FIG. 1) may have two assemblies, one ofwhich is a spindle 31 spring-loaded by spring 30 and having a cone head32 at one end and a slot 33 at its other end and the other assembly is ahydropneumatic cylinder 3 arranged in cover 7 and having a piston 35with a rod 36, and adapted for controlling the gas compression in thepneumatic portion 10 of housing 1.

The spindle 31 is housed in the hydraulic portion 37 made in cover 7 andcommunicating with through hole 28 of the cover and, via a passageway 38in cover 7, with hydraulic portion 11 of the hydropneumatic cylinderarranged in housing 1. Cone head 32 fits in hole 28 by its pointed ortapered portion and shuts off or closes this hole during the workingstroke of a striking means 5, thus preventing the fluid from flowinginto socket 27 during the gas compression in pneumatic portion 10 of thehousing hydropneumatic cylinder.

A trigger 39 mounted on a pin 40 or stud 40 in a pit 41 of cover 7 isdesigned for a manual control of valve 29. Trigger 39 has its one endhinge-connected with rod 36 of piston 35. The travel of piston 35 causesa partial uplift of trigger 39 so that it partially leaves pit 41 beforespindle 31 is manually raised and the through hole 28 is opened when thegas compression in the pneumatic portion 10 of the housinghydropneumatic cylinder is completed.

The middle portion of trigger 39 is connected with spindle 31 by meansof a hinge 42 fitted into slot 33. When moving, piston 35 with rod 36displace trigger 39 with hinge 42 sliding in slot 33 and spindle 31remaining at a checked position, i.e., with hole 28 remaining closed.

Hydropneumatic cylinder 34 of cover 7 has a pneumatic portion 32 and ahydraulic portion 44 separated by piston 35. Pneumatic portion 43 isconnected with pneumatic portion 10 of the hydropneumatic cylinder ofhousing 1 via a port 45 and passageways 24 and made in cover 7 andhousing 1, respectively, and hydraulic portion 44 is connected with apressure main line 46 as well as with hydraulic portion 11 of thehousing hydropneumatic cylinder via a port 47 in cover 7, hydraulicportion 37 and passageway 38.

In order to absorb the shock energy, a shock absorber 48 is installedbetween hollow cylinder 2 and housing 1.

With such arrangement for control valve 29, piston 12 is made in theform of a washer with hollow cylinder 2 extending through the washerhole.

The opration of the single-shot riveting device comprising theabove-described control valve is as follows:

The device is first aimed at a rivet (not shown in the drawing). Thenlever 15 is pressed, and this lever, via a flexible shaft or cable 16,turns on the fluid feed into a passageway 49 from pressure main line 46,for example via a multiplying means (not shown in the drawing).

The fluid is fed into hydraulic portion 44 via passageway 49 and theninto cover cavity 37 via port 47, and by passageway 38 the fluid is fedinto hydraulic portion 11 of the hydropneumatic cylinder of housing I.Floating piston 12 is displaced to the left (in the drawing plane) andcompresses the gas in pneumatic portion 18 of the housing hydropneumaticcylinder to a greater extent by pressure, i.e., the compressed gasenergy is stored for effecting a working stroke by striking means 5.

Piston 35 of hydropneumatic cylinder 34 arranged in cover 7 is at theextreme right-hand position, since the piston effective area is largerat the side of pneumatic portion 43 than at the side of hydraulicportion 44. Head 32 of spindle 31 enters through hole 28 under theaction of spring 30 and shuts off this hole.

When floating piston 12 reaches stops 13, the fluid pressure inhydraulic portion 11 and correspondingly in cover hydraulic cavity 37and hydraulic portion 44 grows, and piston begins to move to the right(in the drawing plane).

Since rod 36 is hinge-connected with trigger 39, the latter will turnaround stud 40 and, due to the travel of hinge 42 in slot 33 of spindle31, partially leave pit 41 Due to the presence of slot 33 in spindle 31,the spindle will remain in the original position shutting off hole 28.Later on, when trigger 39 is manually pressed, the spindle 31 goes up,its head 32 leaves through hole 28 and the fluid from cover hydrauliccavity 37 begins to exert pressure on a striking means 5 via this hole28 and forces the striking means from cover socket 27.

The fluid occupies the volume of socket 27 and drives striking means 5into cavity 4 of cylinder 2, i.e., striking means 5 is speeded up by thefluid which is enclosed within hydraulic portion 1 l at a compressed gaspressure built up in pneumatic portion 10.

Due to the action of the compressed gas present in pneumatic portion 10,the floating piston 12 is displaced to the right, and the fluid isexpelled from the hydraulic portion lll into cavity 4 of cylinder 2 viaopenings 26. From cavity 4 of cylinder 2 the gas is forced out and intohousing cavity 9 via ports 21. Striking means 5 hits or snaps on rivetset means 6 which upsets a rivet shank.

In order to return striking means 5 to its initial position, it isnecessary to release trigger 39 and lever 15. As a result, passageway 48will be connected with a drain line (not shown in the drawings), and thegas held in the housing cavity 9 will drive the striking means 5 intoits initial position, i.e., into socket 27 of cover 7. At the same time,from cavity 4 of cylinder 2, the fluid flows into a drain line viaopenings 26, passageway 38, cover hydraulic cavity 37, port 47,hydraulic portion 44 of cylinder 34 and passageway 49. The remainder ofthe fluid cut off by the end face of striking means 5 in socket 27,assisted by striking means 5, presses out head 32 of spindle 311, andthen it is drained via hole 28, cavity 37, port 47, portion 44 andpassageway 49. Under the action of the gas fed into pneumatic portion 43from pneumatic portion 10 via passageways 25 and 24, piston 35 ofhydropneumatic cylinder 34 is moved to its initial position; at the sametime, trigger 39, while turning around stud 40, enters pit 41. Whichbeing driven by spring 30, head 32 of spindle 31 shuts off hole 28.

Striking means 5 occupies its initial position in socket 27, and is nowready for the next working stroke.

EMBODIMENT II Control valve 29 is made in the form of a hydropneumaticcylinder 50 (FIG. 2) arranged in cover 7. A hydraulic portion 51 of thishydropneumatic cylinder is separated from a pneumatic portion 52 by apiston 53.

Pneumatic portion 52 is connected with pneumatic portion 10 of thehydropneumatic cylinder of housing 1 via a port 54 made in cover 7, andhydraulic portion Sll is connected with hydraulic portion ll of thehousing hydropneumatic cylinder via a passageway 55 of cover 7.

Piston 53 has a hollow rod 56 which is housed in hydraulic portion 51 ofcylinder 50. The free end of this hollow rod is received clearance-freeby through hole 28 of cover 7 thereby preventing the fluid from flowinginto socket 27 of cover 7 from hydraulic portion 11 of the housinghydropneumatic cylinder via this through hole 28, after the pressure hasbeen built up in hydraulic portion 11, and leaves hole 28 forcommunicating socket 27 with hydraulic portion 11 during the workingstroke of striking means 5.

A cavity 57 of rod 56 communicates with through hole 28 and hydraulicportion 11 of the housing hydropneumatic cylinder via ports 58 and 59,respectively, made in rod 56.

Cavity 57 of rod 56 has a spring-loaded check valve 60 arranged thereinwhich shuts off a port 58 running into through hole 28 of cover 7 andopens this port for draining the fluid therethrough from socket 27 ofcover 7 when striking means is being returned to its initial position. i

In such arrangement for the control valve 29, floating piston 12 is madein the form of a washer and cover 7 extends through the washer hole.Valve 29 is opened automatically after the gas compression in thepneumatic portion 10 of the housing hydropneumatic cylinder iscompleted.

The fluid feed into hydraulic portion 11 is accomplished via apassageway 61, and in order to drive striking means 5, the fluid is fedinto socket 27 when rod 56 is drawn out of through hole 28.

The operation of the single-shot riveting device incorporating a controlvalve according to the abovedescribed embodiment is as follows:

After the device is aimed at a rivet, the operator presses lever whichturns on the fluid feed into hydraulic portion 11 of the housinghydropneumatic cylinder from pressure line 46 via passageway 61 by meansof flexible shaft or cable 16. Floating piston 12 moves to the right (inthe drawing plane) and compresses the gas in pneumatic portion 10 of thehousing hydropneumatic cylinder to a greater extent by pressure. Sincethe effective area of piston 53 of hydropneumatic cylinder 50 is largerat the side of pneumatic portion 52 than that of the side of hydraulicportion 51, piston 53 with rod 56 remains at its initial or shut-offposition, i.e. rod 56 is fitted clearance-free in through hole 28 andprevents the fluid from flowing into socket 27 of cover 7 from hydraulicportion 11 via port 59. When floating piston 12 reaches stops 13, thepressure in the hydraulic system grows causing a corresponding pressurerise within hydraulic portion 51 of cylinder 50.

Due to the fluid action, piston 53 is displaced to the right and rod 56leaves hole 28 opening the way for the fluid to flow into hole 28 fromhydraulic portion 51 via recess 62 at the side surface of rod 56.

The continuously growing fluid pressure at hole 28 acts on strikingmeans 5 and presses it out. As a result, striking means 5 leaves coversocket 27, and the fluid inflow appearing in this socket displacesstriking means 5 to the left (in the drawing plane). As soon as thestriking means 5 leaves socket 27 completely, the striking means endface will be affected by the fluid pressure available in a hydraulicportion 11, with the fluid pressure being equal to the compressed gaspressure within pneumatic portion 10. The fluid gets into cavity 4 ofcylinder 2 via openings 26, and speeds up striking means 5 for a shot.

In order to return striking means 5 to its initial position, it isnecessary to release lever 15. Simultaneously, passageway 61 will becommunicated with the drain system, the pressure in hydraulic portion 11of the housing hydropneumatic cylinder will drop and striking means 5will return to its initial position under the action of the gasoperationg in housing cavity 9 while expelling the fluid from cavity 4of cylinder 2 via openings 26, hydraulic portion 11 and passageway 61.Piston 53 driven by the gas operating in pneumatic portion 52 connectedwith pneumatic portion 10 by port 54, with rod 56 also returns to itsinitial position, i.e. rod 56 fits in through hole 28 disconnectinghydraulic portion 51 of hydropneumatic cylinder 50 and socket 27 incover 7 A portion of the fluid is forced out of socket 27 into the drainsystem via hole 28 and port 58, while check valve 60 is retracted, andthen drained via cavity 57 of rod 56, port 59, hydraulic portion 51,passageway 55, hydraulic portion 11 and passageway 61. As soon asstriking means 5 fits in socket 27 completely, check valve 60 willreturn to its initial position and shut off port 58 due to the action ofa spring 63.

Now, the device is now ready for the next working cycle.

EMBODIMENT Ill '64 extends through this hole 67. One end of movable rod64' is capable of entering clearance-free the through hole 28 forpreventing the fluid from flowing into socket 27 of cover 7 via throughhole 28 when the fluid is fed into hydraulic portion 11 of ahydropneumatic cylinder arranged in housing 1, and leaving this throughhole 28 for communicating socket 27 with hydraulic portion 11 during theworking stroke of striking means 5. Rod 64 also ports 69 and madetherein and said rod 64 is communicated by with through. hole 28 andhydraulic portion 11 of the housing hydropneumatic cylinder,respectively.

Shoulder 65 of rod 64 is adapted for restricting the travel of rod 64 inthrough hole 28 of cover 7, and shoulder 66 is adapted for interactingwith floating piston 12 which, while moving, draws out rod 64 fromthrough hole 28 during the striking means working stroke.

Cavity 68 of rod 64 has a spring-loaded check valve 71 arranged thereinwhich opens a port 69 in rod 64 for draining the fluid out from coversocket 27 via this port and hole 28 when the striking means is returnedto its initial position.

The operation of the single-shot riveting device is as follows:

After the device is aimed at the rivet to be clinched, the operatorpresses lever 15 which turns on the fluid supply into hydraulic portion11 of the housing hydropneumatic cylinder from pressure main line 46 viapassageway 61 by means of flexible shaft or cable 16. Floating piston 12will move to the right (in the drawing plane) and compress the gas inpneumatic portion 10 to a greater extent by pressure. it should bementioned that rod 64 is arranged in through hole 28 and is subject tothe action of the gas held in pneumatic portion 10, thus disconnectinghydraulic portion 11 from socket 27.

When moving to the right, floating piston 12 engages with a shoulder 66of rod 64 and starts displacing the latter in order to draw it out ofthrough hole 28. After the compression of the gas in pneumatic portion10 reaches a pre-set or desired extent, rod 64 completely leaves hole 28making hydraulic portion 11 communicable with cover socket 27 viathrough hole 28. The fluid flows into socket 27 from hydraulic portion11 and actuates striking means 5. The latter performs a working strokein a similar manner as has been described earlier in Embodiments l and11. During the working stroke of the striking means 5, the floatingpiston 12 and rod 64 move to the left under the action of gas operatingin the portion 10. A rod 64 fits in a cover hole 28 disconnecting theportion 11 and socket 27 the shoulder 65 abutting against the cover 7and restricting the travel of the rod 64 through the hole 28. To returnthe striking means to its initial position, it is necessary to releasethe lever 15. As a result, the passageway 61 is put in communicationwith the draining system, the pressure in the hydraulic portion 11 ofthe housing hydropneumatic cylinder drops and, under the action of gasoperating in the cavity 9 striking 7 and made at cover 7 and a socket 74made at cover 7 in floating piston 12. Extension 73 can beclearance-free fitted into socket 74 for preventing the fluid fromflowing into socket 27 of cover 7 from hydraulic portion 11 via throughhole 28 when the fluid is fed into hydraulic portion 11, and withdrawnfrom this socket 74 for communicating cover socket 27 with housinghydraulic portion 11 during the working stroke of striking means 5 andtravel of floating piston 12. means 5 returns to its initial positionexpelling the fluid from cavity 4 of the cylinder 2 via openings 26, thehydraulic cavity 11 and the passageway 61. The fluid forced out from thesocket 27 by the striking means 5 retracts a valve 71 via the hole 28and a port 69 and flows into the cavity 68 of the piston 64. From thecavity 68 the fluid is drained via ports 70, the hydraulic cavity 11 andthe passageway 61. Since the fluid pressure in the cavity 11 iscontinuously dropping, a valve 71 will shut off the port 69 under theaction of a spring 72.

The device is now ready for the next working operating cycle.

Embodiment lV spring-loaded check valve 78 arranged therein which opensa port 76 for communicating socket 27 with hydraulic portion 11 whenstriking means 5 is returned to its initial position.

The operation of the single-shot riveting device incorporating thecontrol valve 29 according to the above-described embodiment is asfollows:

After the device is aimed at the rivet to be clinched, the operatorpresses lever which turns on the fluid supply into hydraulic portion 11of housing 1 from pressure main line 46 via passageway 61 by means offlexible shaft or cable 16. Driven by the fluid, floating piston 12 willmove to the right (in the drawing plane) and compress the gas inpneumatic portion 10 to a greater extent by pressure. During the travelof piston 12 in the RH. direction extension 73 of cover 7 leaves pistonsocket 74, and afterthe gas in pneumatic portion 111 is compressed tothe desired extent, extension 73 completely leaves socket 74 makinghydraulic portion 11 communicable with socket 27 via hole 28. The fluidflowing from hole 28 actuates striking means 5. The latter leaves coversocket 27 and performs a working stroke as described above withreference to Embodiments I and ll. During the working stroke of strikingmeans 5, floating piston 12 is moved to the left (in the drawing plane)driven by the gas operating in pneumatic portion 10. Extension 73 enterssocket 74 of piston 12 disconnecting hydraulic portion 11 from socket 27of cover 7.

In order to return striking means 5 to its initial position, it isnecessary to release lever 15. As a result, passageway 61 will becommunicated with the draining system; the pressure in hydraulic portion11 will drop and, driven by the gas operating in housing cavity 9,striking means 5 will return to its initial position expelling the fluidfrom cavity 4 of cylinder 2 via openings 26, hydraulic portion 11 andpassageway 61. The fluid forced out from cover socket 27 via a port 76and a cavity by striking means 5 will retract a valve 78. From cavity 75the fluid gets into hydraulic portion 11 via a port 77 and then isdrained via passageway 61. Since the fluid pressure in hydraulic portion11 is continuously dropping, valve 78 will shut off port 76 under theaction of a spring 79.

The device is now ready for the next working cycle.

We claim:

1. A single-shot riveting device comprising: a housing; a hollowcylinder arrnged in said housing and having a cavity and two end faces;a striking means travelling in said cavity of said hollow cylinder foreffecting clinching; a rivet set means adaptedfor upsetting rivet headsarranged at one end face of said hollow cylinder; ports made in saidhollow cylinder in the vicinity of said rivet set means; a cavity madein said housing and connected with said cylinder cavity via said portsand with a compressed gas source for returning said striking means toits initial position; a hydropneumatic cylinder arranged in said housingand having a high-pressure compressed gas pneumatic portion adapted forstoring the compressed gas energy and effecting a working stroke of saidstriking means, and a hydraulic portion communicating with said hollowcylinder cavity during the travel of said striking means; a floatingpiston separating said pneumatic and hydraulic portions of said housinghydropneumatic cylinder and moving in said housing hydropneumaticcylinder, whereby the compressed gas pressure in said housinghydropneumatic cylinder pneumatic portion is increased for said storageof the compressed gas energy upon the fluid feed into said housinghydropneumatic cylinder hydraulic portion; a cover arranged at the otherend face of said hollow cylinder and fixedly connected with saidhousing; a socket made in said cover at the side of said hollowcylinder, said socket receiving clearance-free the said striking meanswhen the latter is being returned to its initial position and therebypreventing the fluid from flowing into the space between said strikingmeans and said cover from said hydraulic portion when said fluid is fedthereto; a through hole made in said cover and connecting said socketwith said hydraulic cavity during the working stroke of said strikingmeans; a control valve mounted in said cover and shutting off saidcover. through hole when said fluid is fed into said port housinghydropneumatic cylinder hydraulic portion and opening it during theworking stroke and returning said striking means to its initialposition; a pressure main line connected with said hydraulic housinghydra'ulic portion for supplying the fluid thereto.

2. A device as claimed in claim 1, wherein said pneumatic portion ofsaid housing hydropneumatic cylinder has overrunning stops arrangedtherein at the side walls, said stops restricting the travel of saidfloating piston.

3. A device as claimed in claim 1, wherein the comminication of saidhollow cylinder cavity with said housing hydropneumatic cylinderhydraulic portion is effected via openings shut off by said strikingmeans and made in said hollow cylinder in the vicinity of said cover,the fluid from said housing hydropneumatic cylinder hydraulic portionflowing into said hollow cylinder cavity during the working stroke ofsaid striking means via said openings, and said hollow cylinder beingmounted so that it is capable of turning around its axis relative tosaid cover and varying the passage section of saidopenings whereby theshock energy of said striking means may be controlled,

4. A single-shot riveting device comprising: a housing; a hollowcylinder arranged in said housing and having a cavity and two end faces;a striking means travelling in said cavity of said hollow cylinder foreffecting clinching; a rivet set means adapted for upsetting rivet headsarranged at one end face of said hollow cylinder; ports made in saidhollow cylinder in the vicinity of said rivet set means; a cavity madein said housing and connected with said cylinder cavity via said portsand with a compressed gas sourc for returning said striking means to itsinitial position; a hydropneumatic cylinder arranged in said housing andhaving a pneumatic portion for high-pressure compressed gas adapted forstoring the-compressed gas energy and effecting a working stroke of saidstriking means and a hydraulic portion for communicating with saidhollowcylinder cavity during the travel of said striking means afloating piston made in the form of a washer, said hollow cylinderextending through the hole of said washer, said floating pistonseparating said pneumatic and hydraulic portions of said housinghydropneumatic cylinder and moving in said housing hydropneumaticcylinder, whereby the compressed gas pressure in said pneumatic portionof said housing hydropneumatic cylinder is increased for said compressedgas energy storage, upon the fluid feed into said hydraulic portion ofsaid housing hydropneumatic cylinder; a cover arranged at the other endface of said hollow cylinder and being fixedly connected with saidhousing; a socket made in said cover at theside of said hollow cylinder,said socket receiving clearance-free said striking means when the latteris being returned to its initial position and preventing the fluid fromflowing into the space between said striking means and said cover fromsaid hydraulic portion when said fluid is fed thereto; a through holemade. in said cover and connecting said socket with said housinghydropneumatic cylinder hydraulic portion during a working stroke ofsaid striking means; a hydraulic cavity made in said cover andcommunicating with said cover through hole and said hydraulic portion ofsaid housing hydropneumatic cylinder; a springloaded spindle arranged insaid cover hydraulic cavity; a cone head arranged at one end of saidspring-loaded spindle and adapted for shutting off said through holecover through hole; a slot made at the other end of said spring-loadedspindle; a starting trigger employed in said device to manually raisesaid spindle and draw out its cone head from said cover through holeduring a working stroke of said striking means; a hydropneumaticcylinder arrnaged in said cover and having a hydraulic portion and apneumatic portion; a piston separating said hydraulic and pneumaticportions of said cover hydropneumatic cylinder; a rod arranged in saidhydraulic portion of said cover hydropneumatic cylinder and having itsone end rigidly connected with said piston thereof and its other endhinge-connected with said starting trigger to ensure a small uplift ofthe latter before said spindle is manually moved up and said coverthrough hole is opened and after the gas compression cycle is completedin said pneumatic portion of said housing hydropneumatic cylinder; apassageway made in said housing and serving as a continuation of saidhousing passageway; said cover and hosing passageways communicating saidpneumatic portion of said cover hydropneumatic cylinder with saidpneumatic portion of said housing hydropneumatic cylinder; a port madein said cover and communicating said hydraulic portion of said coverhydropneumatic cylinder with said cover hydraulic cavity; a pressuremain line feeding said hydraulic portion of said housing hydropneumaticcylinder with the fluid via said hydraulic portion of said coverhydropneumatic cylinder, said cover hydraulic cavity and saidpassageways.

5. A single-shot riveting device comprising: a housing; a hollowcylinder arranged in said housing and having a cavity and two end faces;a striking means travelling within said cavity of said hollow cylinderfor effecting clinching; a rivet set means adapted for upsetting rivetheads arranged at one end face of said hollow cylinder; ports made insaid hollow cylinder in the vicinity of siad rivet means; a cavity madein said housing and connected with said cylinder cavity via said portsand with a compressed gas source for returning said striking means toits initial position; a hydropneumatic cylinder arranged in said housingand having a pneumatic portion for high-pressure compressed gas adaptedfor storing the compressed gas energy and effecting a working stroke ofsaid striking means, and a hydraulic portion communicating with saidhollow cylinder cavity during the travel of said striking means; a coverarranged at the other end side of said hollow clinder and fixedlyconnected with said housing; a floating piston made in the form of awasher, said hollow cylinder extending through the hole of said washer,said floating piston separating said pneumatic and hydraulic portions ofsaid housing of hydropneumatic cylinder, whereby the compressed gaspressure in said pneumatic portion of said hydropneumatic cylinderhousing is increased for said compressed gas energy storage when thefluid is fed into said hydraulic portion of said housing hydropneumaticcylinder; a socket made in said cover at the side of said hollowcylinder, said socket receiving clearance-free said striking means whenthe latter is being returned to its initial position and preventing thefluid from flowing into the space between said striking means and saidcover from said hydraulic portion when said fluid is fed thereto; athrough hole made in said cover and connecting said socket with saidhydraulic portion of said housing hydropneumatic cylinder during aworking stroke of said striking means; a hydropneumatic cylinderarranged in said cover and having a pneumatic portion and a hydraulicportion; a port made in said cover and connecting said pneumatic portionof said cover hydropneumatic cylinder with said pneumatic portion ofsaid housing hydropneumatic cylinder; a passageway made in said coverand connecting said cover hydropneumatic cylinder hydraulic portion withsaid housing hydropneumatic hydraulic portion; a piston of said coverhydropneumatic cylinder separating said portions thereof; a hollow rodarranged in said hydraulic portion of said cover hydropneumatic cylinderand having itsone end connected with said cover hydropneumatic cylinderpiston, and the other end of said hollow rod entering clearance-freesaid cover through hole for preventing the fluid from flowing into saidcover socket from said hydraulic portion of said hydropneumatic cylinderhousing via said cover through hole when siad fluid is fed into saidhydropneumatic cylinder hydrualic housing portion, and leaving saidcover through hole for communicating said cover socket with saidhydropneumatic cylinder hydraulic portion housing during a workingstroke of said striking means; ports made in said hollow rod andconnecting said hydropneumatic cylinder hydraulic portion housing withsaid cover through hole, one of said rod ports running into said coverthrough hole and the other of I said rod ports leading into said coverhydropneumatic cylinder hydraulic portion; a spring-leaded check valvearranged in a cavity of said hollow rod and opening one of said rodports running into said cover through hole for draining the fluidtherethrough from said cover socket when said striking means is beingreturned to its initial position; a pressure main line connected withsaid housing of the hydropneumatic cylinder hydraulic portion forfeeding the fluid thereinto.

6. A single-shot riveting device comprising: a housing; a hollowcylinder arranged in said housing and having a cavity and two end faces;a striking means travelling within said cavity of said hollow cylinderforeffecting clinching; a rivet set means adapted for upsetting rivetheads arranged at one end side of said hollow cylinder; ports made insaid hollow cylinder in the vicinity of said rivet means; a cavity madein said housing and connected with said cylinder cavity via said portsand with a compressed gas source for returning said striking means toits initial position; a hydropneumatic cylinder arranged in said housingand having a high-pressure compressed gas pneumatic portion adapted forstoring the compressed gas energy and effecting a working stroke of saidstriking means, and a hydraulic portion communicating with said hollowcylinder cavity during the travel of said striking means; a floatingpiston separating said pneumatic and hydraulic portions of said housinghydropneumatic cylinder and moving in said housing hydropneumaticcylinder whereby the compressed gas pressure in said housinghydropneumatic cylinder pneumatic portion is increased to a greaterextent for said compressed gas energy storage when the fluid is fed intosaid housing hydropneumatic cylinder hydraulic portion; a cover arrangedat the other end face of said'hollow cylinder and fixedly connected withsaid housing; a socket made in said cover at the side of said hollowcylinder, said socket receiving clearancefree said striking means whenthe latter is being returned to its initial position and preventing thefluid from flowing into the space between said striking means and saidcover from said housing hydropneumatic cylinder hydraulic portion whensaid fluid is fed thereto; a through hole in said cover and connectingsaid socket with said housing hydropneumatic cylinder hydraulic portionduring a working stroke of said striking means; a hole made in saidfloating piston; a movable hollow rod extending through said floatingpiston hole, one end of said movable hollow rod entering clearance-freesaid cover through hole for preventing the fluid from flowing into saidcover sprocketfrom said housing hydropneumatic cylinder hydraulicportion via said cover through hole when the pressure is built up withinsaid housing hydropneumatic cylinder hydraulic portion, and leaving saidcover through hole for communicating said cover socket with said housinghydropneumatic cylinder hydraulic portion during a working stroke ofsaid striking means; ports in said movable hollow rod, said movablehollow rod cavity communicating with said cover through hole and saidhousing hydropneumatic cylinder hydraulic portion via said rod ports;shoulders provided at the outer surface of said movable hollow rod andspaced at some distance from each other, one of said shoulders beingadapted for restricting the travel of said rod in said cover throughhole and the other one being adapted for interacting with said floatingpiston so that during a working stroke of said striking means saidpiston moves up and draws said rod out of said cover through hole; aspring-loaded check valve arranged in said rod cavity and opening one ofsaid rod ports running into said I cover through hole for drawining thefluid therethrough from said cover socket when said striking means isbeing returned to its initial position; a pressure main line connectedwith said housing hydropneumatic cylinder hydraulic portion for feedingthe fluid thereinto.

7. A single-shot riveting device comprising: a housing; a hollowcylinder arranged in said housing and hav-, ing two end faces; astriking means travelling in said hollow cylinder cavity for effectingclinching; a rivet set means adapted for upsetting rivet heads arrangedat one end face of said hollow cylinder; ports made in said hollowcylinder in the vicinity of said rivet set means; a cavity made in saidhousing and connected with said cylinder cavity via said ports and witha compressed gas sourc for returning said striking means to its initialpostion; a hydropneumatic cylinder arranged in said housing and haing ahigh-pressure compressed gas pneumatic portion adapted for storing thecompressed gas energy and effecting a working stroke of said strikingmeans, and a hydraulic portion communicating with said hollow cylindercavity during the travel of said striking means; a floating pistonseparating said pneumatic and hydraulic portions of said housinghydropneumatic cylinder and moving in said housing hydropneumaticcylinder whereby the compressed gas pressure in said hosinghydropneumatic cylinder pneumatic portion is increased to a greaterextent for effecting said compressed gas energy storage when the fluidis fed into said housing hydropneumatic cylinder hydraulic portion; acover arranged at the other end face of said hollow cylinder and fixedlyconnected with said housing; a socket made in said cover at the side ofsaid hollow cylinder, said socket receiving clearancefree said strikingmeans when the latter is being returned to its initial position andpreventing the fluid from flowing into the space between said strikingmeans and said cover from said housing hydropneumatic cylinder hydraulicportion when said fluid is fed thereto; an extension provided at saidcover; a through hole made in said cover so that it passes through saidextension and connects said cover socket when said housinghydropneumatic cylinder hydraulic portion during a working stroke ofsaid striking means; a socket made in said floating piston, saidextension entering clearance-free said piston socket and therebypreventing the fluid from flowing into said cover socket via sai coverthrough hole when said fluid is fed into said housing hydropneumaticcylinder hydraulic portion and leaving said piston socket forcommunicating said cover socket with said housing hydropneumaticcylinder hydraulic for communicating said cover socket with said housinghydropneumatic cylinder hydraulic portion when said striking means isbeing returned to its initial position; a pressure main line connectedwith said housing by dropneumatic cylinder hydraulic portion for feedingthe fluid thereinto.

1. A single-shot riveting device comprising: a housing; a hollowcylinder arrnged in said housing and having a cavity and two end faces;a striking means travelling in said cavity of said hollow cylinder foreffecting clinching; a rivet set means adapted for upsetting rivet headsarranged at one end face of said hollow cylinder; ports made in saidhollow cylinder in the vicinity of said rivet set means; a cavity madein said housing and connected with said cylinder cavity via said portsand with a compressed gas source for returning said striking means toits initial position; a hydropneumatic cylinder arranged in said housingand having a high-pressure compressed gas pneumatic portion adapted forstoring the compressed gas energy and effecting a working stroke of saidstriking means, and a hydraulic portion communicating with said hollowcylinder cavity durinG the travel of said striking means; a floatingpiston separating said pneumatic and hydraulic portions of said housinghydropneumatic cylinder and moving in said housing hydropneumaticcylinder, whereby the compressed gas pressure in said housinghydropneumatic cylinder pneumatic portion is increased for said storageof the compressed gas energy upon the fluid feed into said housinghydropneumatic cylinder hydraulic portion; a cover arranged at the otherend face of said hollow cylinder and fixedly connected with saidhousing; a socket made in said cover at the side of said hollowcylinder, said socket receiving clearance-free the said striking meanswhen the latter is being returned to its initial position and therebypreventing the fluid from flowing into the space between said strikingmeans and said cover from said hydraulic portion when said fluid is fedthereto; a through hole made in said cover and connecting said socketwith said hydraulic cavity during the working stroke of said strikingmeans; a control valve mounted in said cover and shutting off said coverthrough hole when said fluid is fed into said port housinghydropneumatic cylinder hydraulic portion and opening it during theworking stroke and returning said striking means to its initialposition; a pressure main line connected with said hydraulic housinghydraulic portion for supplying the fluid thereto.
 2. A device asclaimed in claim 1, wherein said pneumatic portion of said housinghydropneumatic cylinder has overrunning stops arranged therein at theside walls, said stops restricting the travel of said floating piston.3. A device as claimed in claim 1, wherein the comminication of saidhollow cylinder cavity with said housing hydropneumatic cylinderhydraulic portion is effected via openings shut off by said strikingmeans and made in said hollow cylinder in the vicinity of said cover,the fluid from said housing hydropneumatic cylinder hydraulic portionflowing into said hollow cylinder cavity during the working stroke ofsaid striking means via said openings, and said hollow cylinder beingmounted so that it is capable of turning around its axis relative tosaid cover and varying the passage section of said openings whereby theshock energy of said striking means may be controlled.
 4. A single-shotriveting device comprising: a housing; a hollow cylinder arranged insaid housing and having a cavity and two end faces; a striking meanstravelling in said cavity of said hollow cylinder for effectingclinching; a rivet set means adapted for upsetting rivet heads arrangedat one end face of said hollow cylinder; ports made in said hollowcylinder in the vicinity of said rivet set means; a cavity made in saidhousing and connected with said cylinder cavity via said ports and witha compressed gas sourc for returning said striking means to its initialposition; a hydropneumatic cylinder arranged in said housing and havinga pneumatic portion for high-pressure compressed gas adapted for storingthe compressed gas energy and effecting a working stroke of saidstriking means and a hydraulic portion for communicating with saidhollow cylinder cavity during the travel of said striking means afloating piston made in the form of a washer, said hollow cylinderextending through the hole of said washer, said floating pistonseparating said pneumatic and hydraulic portions of said housinghydropneumatic cylinder and moving in said housing hydropneumaticcylinder, whereby the compressed gas pressure in said pneumatic portionof said housing hydropneumatic cylinder is increased for said compressedgas energy storage, upon the fluid feed into said hydraulic portion ofsaid housing hydropneumatic cylinder; a cover arranged at the other endface of said hollow cylinder and being fixedly connected with saidhousing; a socket made in said cover at the side of said hollowcylinder, said socket receiving clearance-free said striking means whenthe latter is being returned to its initial position and preventing thefluid from flowing into the space between said striking means and saidcover from said hydraulic portion when said fluid is fed thereto; athrough hole made in said cover and connecting said socket with saidhousing hydropneumatic cylinder hydraulic portion during a workingstroke of said striking means; a hydraulic cavity made in said cover andcommunicating with said cover through hole and said hydraulic portion ofsaid housing hydropneumatic cylinder; a spring-loaded spindle arrangedin said cover hydraulic cavity; a cone head arranged at one end of saidspring-loaded spindle and adapted for shutting off said through holecover through hole; a slot made at the other end of said spring-loadedspindle; a starting trigger employed in said device to manually raisesaid spindle and draw out its cone head from said cover through holeduring a working stroke of said striking means; a hydropneumaticcylinder arrnaged in said cover and having a hydraulic portion and apneumatic portion; a piston separating said hydraulic and pneumaticportions of said cover hydropneumatic cylinder; a rod arranged in saidhydraulic portion of said cover hydropneumatic cylinder and having itsone end rigidly connected with said piston thereof and its other endhinge-connected with said starting trigger to ensure a small uplift ofthe latter before said spindle is manually moved up and said coverthrough hole is opened and after the gas compression cycle is completedin said pneumatic portion of said housing hydropneumatic cylinder; apassageway made in said housing and serving as a continuation of saidhousing passageway; said cover and hosing passageways communicating saidpneumatic portion of said cover hydropneumatic cylinder with saidpneumatic portion of said housing hydropneumatic cylinder; a port madein said cover and communicating said hydraulic portion of said coverhydropneumatic cylinder with said cover hydraulic cavity; a pressuremain line feeding said hydraulic portion of said housing hydropneumaticcylinder with the fluid via said hydraulic portion of said coverhydropneumatic cylinder, said cover hydraulic cavity and saidpassageways.
 5. A single-shot riveting device comprising: a housing; ahollow cylinder arranged in said housing and having a cavity and two endfaces; a striking means travelling within said cavity of said hollowcylinder for effecting clinching; a rivet set means adapted forupsetting rivet heads arranged at one end face of said hollow cylinder;ports made in said hollow cylinder in the vicinity of siad rivet means;a cavity made in said housing and connected with said cylinder cavityvia said ports and with a compressed gas source for returning saidstriking means to its initial position; a hydropneumatic cylinderarranged in said housing and having a pneumatic portion forhigh-pressure compressed gas adapted for storing the compressed gasenergy and effecting a working stroke of said striking means, and ahydraulic portion communicating with said hollow cylinder cavity duringthe travel of said striking means; a cover arranged at the other endside of said hollow clinder and fixedly connected with said housing; afloating piston made in the form of a washer, said hollow cylinderextending through the hole of said washer, said floating pistonseparating said pneumatic and hydraulic portions of said housing ofhydropneumatic cylinder, whereby the compressed gas pressure in saidpneumatic portion of said hydropneumatic cylinder housing is increasedfor said compressed gas energy storage when the fluid is fed into saidhydraulic portion of said housing hydropneumatic cylinder; a socket madein said cover at the side of said hollow cylinder, said socket receivingclearance-free said striking means when the latter is being returned toits initial position and preventing the fluid from flowing into thespace between said striking means and said cover from said hydraulicportion when said fluid is fed thereto; a through hole made in saidcover and connecting said socket wiTh said hydraulic portion of saidhousing hydropneumatic cylinder during a working stroke of said strikingmeans; a hydropneumatic cylinder arranged in said cover and having apneumatic portion and a hydraulic portion; a port made in said cover andconnecting said pneumatic portion of said cover hydropneumatic cylinderwith said pneumatic portion of said housing hydropneumatic cylinder; apassageway made in said cover and connecting said cover hydropneumaticcylinder hydraulic portion with said housing hydropneumatic hydraulicportion; a piston of said cover hydropneumatic cylinder separating saidportions thereof; a hollow rod arranged in said hydraulic portion ofsaid cover hydropneumatic cylinder and having its one end connected withsaid cover hydropneumatic cylinder piston, and the other end of saidhollow rod entering clearance-free said cover through hole forpreventing the fluid from flowing into said cover socket from saidhydraulic portion of said hydropneumatic cylinder housing via said coverthrough hole when siad fluid is fed into said hydropneumatic cylinderhydrualic housing portion, and leaving said cover through hole forcommunicating said cover socket with said hydropneumatic cylinderhydraulic portion housing during a working stroke of said strikingmeans; ports made in said hollow rod and connecting said hydropneumaticcylinder hydraulic portion housing with said cover through hole, one ofsaid rod ports running into said cover through hole and the other ofsaid rod ports leading into said cover hydropneumatic cylinder hydraulicportion; a spring-leaded check valve arranged in a cavity of said hollowrod and opening one of said rod ports running into said cover throughhole for draining the fluid therethrough from said cover socket whensaid striking means is being returned to its initial position; apressure main line connected with said housing of the hydropneumaticcylinder hydraulic portion for feeding the fluid thereinto.
 6. Asingle-shot riveting device comprising: a housing; a hollow cylinderarranged in said housing and having a cavity and two end faces; astriking means travelling within said cavity of said hollow cylinder foreffecting clinching; a rivet set means adapted for upsetting rivet headsarranged at one end side of said hollow cylinder; ports made in saidhollow cylinder in the vicinity of said rivet means; a cavity made insaid housing and connected with said cylinder cavity via said ports andwith a compressed gas source for returning said striking means to itsinitial position; a hydropneumatic cylinder arranged in said housing andhaving a high-pressure compressed gas pneumatic portion adapted forstoring the compressed gas energy and effecting a working stroke of saidstriking means, and a hydraulic portion communicating with said hollowcylinder cavity during the travel of said striking means; a floatingpiston separating said pneumatic and hydraulic portions of said housinghydropneumatic cylinder and moving in said housing hydropneumaticcylinder whereby the compressed gas pressure in said housinghydropneumatic cylinder pneumatic portion is increased to a greaterextent for said compressed gas energy storage when the fluid is fed intosaid housing hydropneumatic cylinder hydraulic portion; a cover arrangedat the other end face of said hollow cylinder and fixedly connected withsaid housing; a socket made in said cover at the side of said hollowcylinder, said socket receiving clearance-free said striking means whenthe latter is being returned to its initial position and preventing thefluid from flowing into the space between said striking means and saidcover from said housing hydropneumatic cylinder hydraulic portion whensaid fluid is fed thereto; a through hole in said cover and connectingsaid socket with said housing hydropneumatic cylinder hydraulic portionduring a working stroke of said striking means; a hole made in saidfloating piston; a movable hollow rod extending through said floatingpiston hole, onE end of said movable hollow rod entering clearance-freesaid cover through hole for preventing the fluid from flowing into saidcover sprocket from said housing hydropneumatic cylinder hydraulicportion via said cover through hole when the pressure is built up withinsaid housing hydropneumatic cylinder hydraulic portion, and leaving saidcover through hole for communicating said cover socket with said housinghydropneumatic cylinder hydraulic portion during a working stroke ofsaid striking means; ports in said movable hollow rod, said movablehollow rod cavity communicating with said cover through hole and saidhousing hydropneumatic cylinder hydraulic portion via said rod ports;shoulders provided at the outer surface of said movable hollow rod andspaced at some distance from each other, one of said shoulders beingadapted for restricting the travel of said rod in said cover throughhole and the other one being adapted for interacting with said floatingpiston so that during a working stroke of said striking means saidpiston moves up and draws said rod out of said cover through hole; aspring-loaded check valve arranged in said rod cavity and opening one ofsaid rod ports running into said cover through hole for drawining thefluid therethrough from said cover socket when said striking means isbeing returned to its initial position; a pressure main line connectedwith said housing hydropneumatic cylinder hydraulic portion for feedingthe fluid thereinto.
 7. A single-shot riveting device comprising: ahousing; a hollow cylinder arranged in said housing and having two endfaces; a striking means travelling in said hollow cylinder cavity foreffecting clinching; a rivet set means adapted for upsetting rivet headsarranged at one end face of said hollow cylinder; ports made in saidhollow cylinder in the vicinity of said rivet set means; a cavity madein said housing and connected with said cylinder cavity via said portsand with a compressed gas sourc for returning said striking means to itsinitial postion; a hydropneumatic cylinder arranged in said housing andhaing a high-pressure compressed gas pneumatic portion adapted forstoring the compressed gas energy and effecting a working stroke of saidstriking means, and a hydraulic portion communicating with said hollowcylinder cavity during the travel of said striking means; a floatingpiston separating said pneumatic and hydraulic portions of said housinghydropneumatic cylinder and moving in said housing hydropneumaticcylinder whereby the compressed gas pressure in said hosinghydropneumatic cylinder pneumatic portion is increased to a greaterextent for effecting said compressed gas energy storage when the fluidis fed into said housing hydropneumatic cylinder hydraulic portion; acover arranged at the other end face of said hollow cylinder and fixedlyconnected with said housing; a socket made in said cover at the side ofsaid hollow cylinder, said socket receiving clearance-free said strikingmeans when the latter is being returned to its initial position andpreventing the fluid from flowing into the space between said strikingmeans and said cover from said housing hydropneumatic cylinder hydraulicportion when said fluid is fed thereto; an extension provided at saidcover; a through hole made in said cover so that it passes through saidextension and connects said cover socket when said housinghydropneumatic cylinder hydraulic portion during a working stroke ofsaid striking means; a socket made in said floating piston, saidextension entering clearance-free said piston socket and therebypreventing the fluid from flowing into said cover socket via sai coverthrough hole when said fluid is fed into said housing hydropneumaticcylinder hydraulic portion and leaving said piston socket forcommunicating said cover socket with said housing hydropneumaticcylinder hydraulic portion during a working stroke of said strikingmeans and travel of said floating piston; a cavity in said cover; portsmade in said cover and conNecting said cavity with said housinghydropneumatic cylinder hydraulic portion and with said cover socket; aspring-loaded check valve arranged in said cover cavity and opening oneof said cover ports running into said cover socket for communicatingsaid cover socket with said housing hydropneumatic cylinder hydraulicportion when said striking means is being returned to its initialposition; a pressure main line connected with said housinghydropneumatic cylinder hydraulic portion for feeding the fluidthereinto.